Restructure log location

Resolves #7 (closed)

mpsd-software-environment.py

@@ -32,7 +32,9 @@ for given system architecture and MPSD software stack version.\n
 The toolchains
 are built using the bash script spack_setup.sh, and the results are logged. """
 
-call_date_iso = datetime.datetime.now().replace(microsecond=0).isoformat()
+call_date_iso = (
+    datetime.datetime.now().replace(microsecond=0).isoformat().replace(":", "-")
+)
 config_vars = {
     #  kept inside the mpsd_release folder
     "cmd_log_file": "install.log",